There more to an alignment then caster, camber and toe. There's also Steering Inclination Angle(SAI), Included angle, Turn Radius, And set back. I'm also not a fan of setting one up with different measurements from one side to the other. They should be very close.
Next alignment tell the guy he has to do his job and give you all the numbers.
In a perfect world the tie rods should be as close to parallel to the center link, parallel to the control arms to minimize bump steer. If not there is toe out and in as the suspension cycles through it's travel. Bumpsteer. You can have caster , camber, and toe correct, and have a tweaked knuckle, tweaked frame, or tweaked centerlink that can introduce bumpsteer. The SAI, IA, turn radius, and set back numbers are important when trying to diagnose problems.
You can have bumpsteer issues going straight down the highway at 70 mph is something tweaked.
"The tires look good" is really not good enough here. Tires can look fine and have belt issues internally and drive like shyt. Those issues will normally show up if a road force balance is done.
Finding an alignment guy that knows suspensions is hard to do. Alignment guys that have been trained to work the rack and have little understanding are dime a dozen.